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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Caracteriza??o morfodin?mica e sedimentologia da Plataforma Continental Rasa na APA Estadual dos Recifes de Corais - RN

Santos, Jonas Ricardo dos 25 February 2010 (has links)
Made available in DSpace on 2015-03-13T17:08:27Z (GMT). No. of bitstreams: 1 JonasRS_DISSERT.pdf: 3855640 bytes, checksum: 7f71c8f901f81d6604b2c75dddbae414 (MD5) Previous issue date: 2010-02-25 / This study had to aimed to characterize the sediments of shallow continental shelf and realize the mapping of features visible for satellite images by using remote sensing techniques, digital image processing and analysis of bathymetry between Maxaranguape and Touros - RN. The study s area is located in the continental shallow shelf of Rio Grande do Norte, Brazil, and is part of the Environmental Protection Area (APA) of Coral Reefs. A total of 1186 sediment samples were collected using a dredge type van veen and positioning of the vessel was made out with the aid of a Garmin 520s. The samples were treated In the laboratory to analyze particle size of the sediment, concentration of calcium carbonate and biogenic composition. The digital images from the Landsat-5 TM were used to mapping of features. This stage was used the band 1 (0,45-1,52 ?m) where the image were georeferenced, and then adjusting the histogram, giving a better view of feature bottom and contacts between different types of bottom. The results obtained from analysis of the sediment showed that the sediments of the continental shelf east of RN have a dominance of carbonate facies and a sand-gravelly bottom because the region is dominated by biogenic sediments, that are made mainly of calcareous algae. The bedform types identified and morphological features found were validated by bathymetric data and sediment samples examined. From the results obtained a division for the shelf under study is suggested, these regions being subdivided, in well characterized: (1) Turbid Zone, (2) Coral Patch Reefs Zone, (3) Mixed Sediments Carbonates Zone, ( 4) Algae Fouling Zone, (5) Alignment Rocky Zone, (6) Sand Waves Field (7) Deposit siliciclastic sands / O presente trabalho teve por objetivo caracterizar os sedimentos da plataforma continental rasa e realizar o mapeamento das fei??es vis?veis por imagens de sat?lite, utilizando t?cnicas de sensoriamento remoto, processamento digital de imagens e an?lise batim?trica entre Maxaranguape e Touros RN. A ?rea de estudo est? localizada no segmento de transi??o entre a por??o oriental e a setentrional da plataforma continental do Estado do Rio Grande do Norte, Brasil, e est? inserida na ?rea de Prote??o Ambiental (APA) dos Recifes de Corais. Um total de 1186 amostras de sedimento foram coletadas usando uma draga do tipo Van Veen e o posicionamento da embarca??o foi realizado com o aux?lio de um GPS Garmin 520s. Em laborat?rio, as amostras foram tratadas para realizar a an?lise granulom?trica, concentra??o do teor de carbonato de c?lcio e composi??o biog?nica. Para o mapeamento das fei??es foram utilizadas as imagens digitais do Landsat 5-TM (orbita 214/064 de 07 de agosto de 2005). Foi utilizada a banda 1 (0,45-1,52 ?m), sendo realizada a corre??o geom?trica, e posteriormente o ajuste do histograma, gerando uma melhor visualiza??o das fei??es de fundo e os contatos entre os diferentes tipos de fundo. A partir dos resultados obtidos da an?lise dos sedimentos verificou-se que os sedimentos da plataforma continental oriental do RN apresenta uma domin?ncia da f?cies carbon?tica e de um fundo areno-cascalhoso em fun??o da regi?o ser dominada por sedimentos biog?nicos, que s?o constitu?dos principalmente por algas calc?rias. As fei??es morfol?gicas de fundo encontradas foram validadas atrav?s de dados batim?tricos e amostras de sedimentos analisadas. A partir dos resultados obtidos uma divis?o apropriada para a plataforma em estudo ? sugerida, sendo estas regi?es subdividas, em zonas bem caracterizadas: (1) Zona T?rbida, (2) Zona de Bancos Recifais, (3) Zona de Sedimentos Carbon?ticos Mistos, (4) Zona de Algas Incrustantes, (5) Zona de Alinhamentos Rochosos, (6) Campo de dunas Submersas e (7) Dep?sito Areias Silicicl?sticas.

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